DetailedDescription

GASS Server Implementation API.
Another mode of using the GASS Transfer API is to implement data
servers. The primary difference between the client and server parts of
the GASS Transfer API are how requests are generated.
To implement a server, the user would call
globus_gass_transfer_create_listener() to create a new server port on
which a specific protocol will be used to request file transfer
operations. The user may obtain the URL that the listener is bound to
by calling globus_gass_transfer_listener_get_base_url().
Once the listener is created, the user can call
globus_gass_transfer_register_listen() to wait for clients to connect
to it. Once the server has detected an attempt to connect by a client,
the use can call globus_gass_transfer_register_accept() to accept the
connection from the client and parse the request.
In the callback associated with globus_gass_transfer_register_accept(),
the server can decide how to process the request. The user may choose
to authorize the request by calling globus_gass_transfer_authorize(),
refer it to another URL or URLs by calling globus_gass_transfer_refer()
or deny the client access to the URL by calling
globus_gass_transfer_deny().

FunctionDocumentation

intglobus_gass_transfer_create_listener(globus_gass_transfer_listener_t*listener,globus_gass_transfer_listenerattr_t*attr,char*scheme)
Create a new protocol-specific listener socket for a GASS server. This
function creates a new socket to listen for client connections as a
GASS server. The listener handle pointer is initialized to contain the
a new handle which can be used in subsequent server operations.
After calling this function, a user may call the
globus_gass_transfer_register_listen() or
globus_gass_transfer_close_listener() functions with this listener
handle.
Parameters:listener A new listener handle to initialize.
attr Protocol-specific attributes for the new listener.
scheme The protocol scheme to implement for the listener.
Returnvalues:GLOBUS_SUCCESS The listener was successfully created.
GLOBUS_GASS_TRANSFER_ERROR_NULL_POINTER The listener or scheme
parameter was NULL
GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The scheme is not
supported by any protocol module.
GLOBUS_GASS_TRANSFER_ERROR_MALLOC_FAILED Data structures associated
with the transfer could not be allocated.
intglobus_gass_transfer_close_listener(globus_gass_transfer_listener_tlistener,globus_gass_transfer_close_callback_tcallback,void*user_arg)
Close a GASS listener. This function calls the protocol specific
function needed to close a GASS server listener port. Callbacks for any
outstanding accepts will be called before the close callback is
invoked.
Parameters:listener Listener handle created by calling
globus_gass_transfer_create_listener().
callback Function to call once the listener handle has been closed.
user_arg Argument to be passed to the callback function.
Returnvalues:GLOBUS_SUCCESS The close operation was successfully registered on
the listener.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The listener handle was
invalid.
GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED The listener handle was
not properly initialized.
GLOBUS_GASS_TRANSFER_ERROR_DONE A close has already been registered
on the listener.
intglobus_gass_transfer_register_listen(globus_gass_transfer_listener_tlistener,globus_gass_transfer_listen_callback_tcallback,void*user_arg)
Listen for new client connections. This function causes the listener
handle to listen for new client connections. When one is ready, it
calls the specified callback function, letting the server implementer
continue to accept the connection and process the request.
Parameters:listener The listener handle to register for new connections.
callback Function to call when a new connection may be accepted.
user_arg Argument to be passed to the callback function.
Returnvalues:GLOBUS_SUCCESS The listen callback has been registered with the
protocol module.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE An invalid listener handle
was passed to this function.
GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED An uninitialized
listener handle was passed to this function.
GLOBUS_GASS_TRANSFER_ERROR_ALREADY_REGISTERED The listener has
already been registered for a new connection.
GLOBUS_GASS_TRANSFER_ERROR_DONE The listener has been registered
for closing.
Seealso:globus_gass_transfer_register_accept();
intglobus_gass_transfer_register_accept(globus_gass_transfer_request_t*request,globus_gass_transfer_requestattr_t*attr,globus_gass_transfer_listener_tlistener,globus_gass_transfer_callback_tcallback,void*user_arg)
Accept new client connections. This function causes the listener handle
to accept a new connection on the listener and parse the file request.
Once the file request has been parsed, the specified callback function
will be called. The server implementation must then either authorize,
deny, or refer this request.
Parameters:request A pointer to a new request handle. This request handle will
be initialized when the callback function is invoked.
attr Request attributes.
listener The listener handle to register for the new request.
callback Function to call when the protocol module has parsed the
file request.
user_arg Argument to be passed to the callback function.
Returnvalues:GLOBUS_SUCCESS The listen callback has been registered with the
protocol module.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE An invalid listener handle
was passed to this function.
GLOBUS_GASS_TRANSFER_ERROR_NOT_INITIALIZED An uninitialized
listener handle was passed to this function.
GLOBUS_GASS_TRANSFER_ERROR_INTERNAL_ERROR The request could not be
initialized due to some internal resource depletion.
GLOBUS_GASS_NOT_REGISTERED. The
globus_gass_transfer_register_listen() function has not yet been
called.
GLOBUS_GASS_ALREADY_REGISTERED. The listener is already processing
a new request.
GLOBUS_GASS_TRANSFER_ERROR_DONE The listener has been registered
for closing.
Seealso:globus_gass_transfer_register_listen();
void*globus_gass_transfer_listener_get_user_pointer(globus_gass_transfer_listener_tlistener)
Get the user pointer associated with a listener. This function will
query the listener’s user_pointer field and return it’s value.
Parameters:listener The listener handle.
Returns:
If the listener handle is invalid or the user_pointer’s value has
not been set, then GLOBUS_NULL will be returned. Otherwise, the
value of the user pointer will be returned.
Seealso:globus_gass_transfer_listener_set_user_pointer()intglobus_gass_transfer_listener_set_user_pointer(globus_gass_transfer_listener_tlistener,void*user_pointer)
Set the user pointer associated with a listener. This function will set
the listener’s user_pointer field. The pointer may be used to associate
any pointer-sized data with a listener handle.
Parameters:listener The listener handle.
user_pointer The value of the user pointer.
Returnvalues:GLOBUS_SUCCESS The user pointer was successfully set.
GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The listener handle was
invalid.
Seealso:globus_gass_transfer_listener_get_user_pointer()char*globus_gass_transfer_listener_get_base_url(globus_gass_transfer_listener_tlistener)
Get the base URL of a listener. This function queries a listener handle
for the base URL which the server is listening on. For most protocols,
this contains the protocol scheme, host, and port that the listener has
registered itself on.
Parameters:listener The listener handle to query.
Returns:
This function returns a pointer to a string containing the base
URL. This string must not be freed or modified by the caller. It
may not be referred to after the function
globus_gass_transfer_listener_close() has been called.
intglobus_gass_transfer_refer(globus_gass_transfer_request_trequest,char**urls,globus_size_tnum_urls)
Refer a request. This function causes the request to be referred to
another URL or list of URLs. It should be called in response to a
request accept callback when the server wants to refer the client to
another server or servers to process the request.
Parameters:request A new request handle, passed to the server in an accept
callback.
urls An array of strings, each being a URL pointing to sources of
the same data as the original URL.
num_urls The length of the urls array.
Returnvalues:GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
valid, not created by calling
globus_gass_transfer_register_accept(), or has already been denied
or authorized.
GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
not support referrals.
Seealso:globus_gass_transfer_deny(), globus_gass_transfer_authorize()intglobus_gass_transfer_authorize(globus_gass_transfer_request_trequest,globus_size_ttotal_length)
Authorize a request. This function causes the request to be authorized
for processing. It should be called in response to a request accept
callback when the server wants to agree to process this request. After
calling this function, the server implementation should call
globus_gass_transfer_send_bytes() or
globus_gass_transfer_receive_bytes() to send or receive the data
associated with the URL.
Parameters:request A new request handle, passed to the server in an accept
callback.
total_length For a ’get’ request, the total_length of the file to
be retrieved if known. This value may be GLOBUS_GASS_LENGTH_UNKNOWN
if the protocol supports transferring arbitrarily-sized files.
Returnvalues:GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
valid, not created by calling
globus_gass_transfer_register_accept(), or has already been denied
or authorized.
GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
not support authorizing requests.
Seealso:globus_gass_transfer_refer(), globus_gass_transfer_deny()intglobus_gass_transfer_deny(globus_gass_transfer_request_trequest,intreason,char*message)
Deny a request. This function causes the request to be denied for
further processing. It should be called in response to a request ccept
callback when the server wants to refuse processing this request for
the client. After calling this function, the server implementation need
do nothing further with the request handle.
Parameters:request A new request handle, passed to the server in an accept
callback.
reason A protocol-specific reason code.
message An informational message to be sent to the client.
Returnvalues:GLOBUS_GASS_TRANSFER_ERROR_INVALID_USE The request handle was not
valid, not created by calling
globus_gass_transfer_register_accept(), or has already been denied
or authorized.
GLOBUS_GASS_TRANSFER_ERROR_NOT_IMPLEMENTED The protocol module does
not support denying requests.
Seealso:globus_gass_transfer_refer(), globus_gass_transfer_authorize()

Author

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